2018 Impact factor 2.481
Hadrons and Nuclei


Eur. Phys. J. A 12, 217-229 (2001)

Isoscalar-isovector interferences in $\pi N\to N e^+e^-$ reactions as a probe of baryon resonance dynamics

A.I. Titov1, 2 and B. Kämpfer1

1  Forschungszentrum Rossendorf, PF 510119, 01314 Dresden, Germany
2  Bogolyubov Laboratory of Theoretical Physics, JINR, Dubna 141980, Russia

kaempfer@fz-rossendorf.de

(Received: 14 August 2001 Communicated by V.V. Anisovich)

Abstract
The isoscalar-isovector ($\rho$-$\omega$) interferences in the exclusive reactions $\pi^-p\to n e^+e^-$ and $\pi^+n \to p e^+e^-$ near the $\omega$ threshold leads to a distinct difference of the dielectron invariant-mass distributions depending on beam energy. The strength of this effect is determined by the coupling of resonances to the nucleon vector-meson channels and other resonance properties. Therefore, a combined analysis of these reactions can be used as a tool for determining the baryon resonance dynamics.

PACS
13.75.-n - Hadron-induced low- and intermediate-energy reactions and scattering (energy less than or equal to 10 GeV).
14.20.-c - Baryons (including antiparticles).
21.45.+v - Few-body systems.

© Società Italiana di Fisica, Springer-Verlag 2001